chore(deps): update dependency antsibull-docs to >=2.12,<2.13 (#528)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[antsibull-docs](https://togithub.com/ansible-community/antsibull-docs)
([changelog](https://togithub.com/ansible-community/antsibull-docs/tree/main/CHANGELOG.md))
| `>=2.11,<2.12` -> `>=2.12,<2.13` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/antsibull-docs/2.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/antsibull-docs/2.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/antsibull-docs/2.11.0/2.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

<details>
<summary>ansible-community/antsibull-docs (antsibull-docs)</summary>

###
[`v2.12.0`](https://togithub.com/ansible-community/antsibull-docs/releases/tag/2.12.0)

[Compare
Source](https://togithub.com/ansible-community/antsibull-docs/compare/2.11.0...2.12.0)

##### Release Summary

Bugfix and feature release.

##### Minor Changes

- Allow to mention forums in the Communication section of collection
links
([#&#8203;288](https://togithub.com/ansible-community/antsibull-docs/pull/288)).
- Bump minimum dependency of <code>antsibull-docs-parser</code> to 1.0.2
or newer
([#&#8203;290](https://togithub.com/ansible-community/antsibull-docs/pull/290)).
- The <code>lint-collection-docs</code> subcommand will now complain
about unchanged default values in <code>docs/docsite/links.yml</code>
taken from the [community collection
template](https://togithub.com/ansible-collections/collection_template/)
([#&#8203;273](https://togithub.com/ansible-community/antsibull-docs/issues/273),
[#&#8203;277](https://togithub.com/ansible-community/antsibull-docs/pull/277)).
- The collection docs linter now reports empty markup, like
<code>I()</code>, <code>L(,https://example.com)</code>
([#&#8203;292](https://togithub.com/ansible-community/antsibull-docs/pull/292)).

##### Bugfixes

- Improve handling of empty markup parameters for RST
([#&#8203;290](https://togithub.com/ansible-community/antsibull-docs/pull/290)).
- Improve rendering of empty or broken changelogs
([#&#8203;289](https://togithub.com/ansible-community/antsibull-docs/pull/289)).
- Remove leading spaces in paragraphs to avoid unintended RST
blockquotes
([#&#8203;289](https://togithub.com/ansible-community/antsibull-docs/pull/289)).
- Render errors as code blocks of language <code>text</code> instead of
using the default lexer
([#&#8203;289](https://togithub.com/ansible-community/antsibull-docs/pull/289)).

</details>

---

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requirements.txt

@@ -9,4 +9,4 @@ requests
 
 # Development requirements
 pylint
-antsibull-docs>=2.11,<2.12
+antsibull-docs>=2.12,<2.13